21.Not until I began to work __________how much time I had wasted.A.didn

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• Not until I began to work ________ how much time I had wasted.A.didn't I realize B.did I realize C.I didn't realize D.I realize
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• I didn't realize how much time I had wasted until I began to work的倒装句
• 21.Not until I began to work __________how much time I had wasted.A.didn21.Not until I began to work __________how much time I had wasted.A.didn’t I realize B.did I realize C.I didn’t realize D.I realized这里为什么要选B 不选A?
• Was it not until you began to work -------how much time you had wasted?A did you realizeB that you realizedC did you not realizeD that you didn't realize我选了A错了,not until的句子不倒装吗?
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